On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeEaston Press, 1976 - 470 páginas |
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Página viii
... theory , and in 1844 a longer essay em- bodying most of his complete theory . Neither of these writings was published ; but since he suffered from continual bad health he left instructions with his wife that in the event of his death ...
... theory , and in 1844 a longer essay em- bodying most of his complete theory . Neither of these writings was published ; but since he suffered from continual bad health he left instructions with his wife that in the event of his death ...
Página x
... theory as soon as possible . He therefore set to work , and during the ensuing thirteen months wrote the first edition of the present book . He called it an Abstract , and he only discussed the outstanding problems and the most ...
... theory as soon as possible . He therefore set to work , and during the ensuing thirteen months wrote the first edition of the present book . He called it an Abstract , and he only discussed the outstanding problems and the most ...
Página xiv
... THEORY Difficulties of the theory of descent with modification - Absence or rarity of transitional varieties - Transitions in habits of life - Diversified habits in the same species - Species with habits widely different from those of ...
... THEORY Difficulties of the theory of descent with modification - Absence or rarity of transitional varieties - Transitions in habits of life - Diversified habits in the same species - Species with habits widely different from those of ...
Contenido
VARIATION UNDER NATURE | 30 |
STRUGGLE FOR EXISTENCE | 45 |
NATURAL SELECTION | 59 |
Derechos de autor | |
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Términos y frases comunes
accumulated adapted admit affinities allied species America ancient appear beak become bees believe belonging birds breeds cause cells characters climate closely allied colour common progenitor continuous crossed crustaceans degree developed difficulty distinct species divergence doubt effects eggs embryo existing exterminated extinct extremely facts favourable fertilised fertility flowers formation forms fossil Fritz Müller genera genus geological geological period gradations greater number groups of species habits Hence hybrids hybrids produced important increase individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less living male mammals manner marsupials migration modified descendants natural selection naturalists nearly nest occasionally offspring organisation organs Origin of Species parent peculiar perfect pigeons pistil plants pollen present preserved principle probably produced quadrupeds ranked reciprocal crosses remarked resemblance rudimentary seeds slight South America stamens sterility structure struggle successive supposed swimbladder theory variability variations varieties vary whilst whole wings young